(Text): Simplify introduction. Discard mention of `M-x
edit-picture', since that is just an alias for picture-mode. (Sentences): Note that repeated M-@ extends the region. (Pages): Make terminology more consistent. Link to Regexps node. (Longlines): Discuss relationship with Visual Line mode. (Text Mode): Remove extraneous discussion of other modes, since they were already introduced in the parent node.
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